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Hello @guglielmirent
The number 600 is not a URL parameter, database, JSON, or any other datasource. So, you can get this value via javascript directly.
Assuming the number field is <input type="number" name="my_number">, you can insert a script tag in the form with the following piece of code:
<script>
jQuery(document).on('click', '[href="#contact"]', function(){
jQuery('[name="my_number"]').val(jQuery(this).attr('data-price1'));
});
</script>Best regards.
